During her time as a Padawan, Wezz either crafted several lightsabers or possessed several lightsaber crystals as she was seen with blue, pink, yellow, and green-bladed weapons throughout her service to the Order. Following the election of Palpatine as Supreme Chancellor, Wezz was assigned a mission to the snow-covered world of Puloorn with her comrades Rorworr, Vor'en Kurn, and Deel Surool to uncover a hidden Sith Temple. The team found the temple ruins, possibly inhabited by dark side beasts or cultists, and reported the findings to Palpatine and the Jedi High Council. Over the course of the next decade, Wezz would study and prepare for her Trials of Knighthood, a series of tests she would pass before being elevated to the rank of Jedi Knight.[5]

The team was so successful that they continued to receive orders directly from the office of the Chancellor and the High Council. One such mission had the group investigating the disappearance of a Republic arsenal ship that had been tasked with decommissioning the Trade Federation Army defeated at Naboo. The investigation led the team to Kwenn Space Station, where they defeated several re-activated battle droids.[7] Another mission to which the team was assigned involved preventing Corann from being the first of the Core Worlds to withdraw from the Republic. Rorworr's team investigated rumors of Separatist activity on the small industrial planet and discovered a droid manufacturing plant.[6]

An accomplished Guardian by the end of the war, Wezz was able to avoid the execution of ContingencyOrder 66 at the end of the war; an order issued by the treasonous Chancellor Palpatine ordering the death of all Jedi. Fleeing from the Grand Army, Wezz came into contact with fellow survivor Master Shadday Potkin and agreed to meet her on Kessel. A month after the birth of the Galactic Empire, Wezz met with Jedi Potkin, Ma'kis'shaalas, Roblio Darté, Tsui Choi, Bultar Swan, Koffi Arana, and Jastus Farr to discuss their next move against Palpatine, who was indeed a Sith Lord. Unbeknownst to all present, Potkin had arrogantly lured Darth Vader to the meeting in hopes that the team could overwhelm the Sith and end the Empire. Sia-Lan Wezz was the first to attack Vader, charging toward him with her lightsaber poised high. She was no match for the Dark Lord of the Sith though, who easily extended his lightsaber through her chest, and sliced off her hand before her dead body hit the floor.[2]

Leland Chee stated the possibility that Galactic Campaign Guide was only providing a hypothetical situation regarding the Skorrupon death, and might get noted in the Holocron continuity database as "One report indicated that Sia-Lan Wezz had been lost at the Battle of Skorrupon".[source?]

In Star Wars: Purge, Sia-Lan's lightsaber changes color from green to pink when Darth Vader slices her hand off. Other sources have depicted her with a yellow or blue lightsaber.